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Thuja
http://www.botanik.uni-bonn.de/conifers/cu/th/index.htm
Description of the genus and its five species.
Thuja occidentalis
http://www.fs.fed.us/database/feis/plants/tree/thuocc/
Information on distribution and occurrence, value and use, characteristics, and fire ecology.
Thuja plicata
http://www.fs.fed.us/database/feis/plants/tree/thupli/
Information on distribution and occurrence, value and use, characteristics, and fire ecology.